Method of electrolytically depositing chromium



Patent ed UNITED i STATES PATENT OFFICE 'PLATE, INC, 01 UNION CITY, NEW JEEY,'.A

or manna-Amman, 11mm aarrzre, GERMANY, ASSIGNOB 'ro anomoonro'narron on new man METHOD OF ELECTROLYT ICALLY DEPOSITHIG CHE-GENE No Drawing. Application filed August 7, 1925,

tion and ofthe oxidizing agents may be varied within very wide hmlts.

As for instance, the initial concentration of the chromic acid solution ma be that usual in electrolytes for metal eposition. .To obtain the highest concentration of the oxidizingagents, they may be dissolved in water just suflicient for the purpose, and

Serial m. 48,883, and in Germany August 14, 19:4.

ing a solution containing a chromic acid radical with an oxidizing agent of the order of peroxide of hydrogen, and other than achroand electrolyzing the mium oxidizing agent solution.

In testimony'whereo may addedin this form to solid chromic I acld.

The concentration of the solutions of the oxidizing agent. employed is determined by its character and activity. With'hydrogen peroxide a 1-'30% solution may be used. he voltage inthe electrolyte may be'4 volts when the electrodes are 3 inches apart, and is preferably 4-5 volts, a suitable current density being about 20 amperesper square decimeter.

It will be understood that the concentrations, voltages, current densities, etc. indicated above are merely given by way of example and that such data may be varied as vdesired without departing from myjinvention. r

I claim 1'. A method of electrolytically depositing 40 metallic chromium, which consists in treating a solution containing a chromic acid radical with peroxide of hydrogen, and electrolyzin the solution.

- 2. method of electrolytically depositing.

metallic chromium, which consists in treati f I afiix my signature. OSKAR HAHN. 

